【Canvas】线性渐变色例子-垂直方向渐变
<!DOCTYPE html>
<html lang="utf-8">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
<head>
<title>线性渐变色例子-垂直方向渐变</title>
</head>
<body onload="draw()">
<canvas id="myCanvus" width="400px" height="400px" style="border:1px dashed black;">
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</canvas>
</body>
</html>
<script type="text/javascript">
<!--
function draw(){
var canvas=document.getElementById('myCanvus');
canvas.width=400;
canvas.height=400;
var ctx=canvas.getContext('2d');
ctx.translate(200,200);
// 从上到下垂直渐变，注意之前有平移
var linegrad=ctx.createLinearGradient(0,-200,0,200);
linegrad.addColorStop(0,"white");// 白色
linegrad.addColorStop(1,"navy");// 海蓝
ctx.fillStyle=linegrad;
ctx.fillRect(-200,-200,400,400);
};
//-->
</script>
效果：
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